Output Impedance vs. Frequency

What is Superpower's output performance under load? Amazing! Here is a graph of Zout vs.
frequency, showing a 7mΩ maximum impedance
while delivering 100mA at 40KHz. This is measured on a typical production SPL78 with 5V out.

How do we get such amazing performance? Sorry, that's a secret. But
we can tell you how we measured it—we connected a resistor between the
regulator output and a sine wave voltage source, then used a spectrum
analyzer to measure the variation in regulator output voltage, which
ideally is zero. The difference from zero equates to the output
impedance of the regulator.

We know the current and the voltage so the values above are used to calculate output impedance. Using the spectrum analyzer full
scale value of 0.2Vpp, we see the following values for output impedance vs. frequency:

Frequency

50Ω load (100mA pk-pk)

10Hz

1.0mΩ

100Hz

0.56mΩ

1KHz

0.71mΩ

5KHz

2.0mΩ

10KHz

2.82mΩ

20KHz

4.47mΩ

40KHz

7.08mΩ

Superpower Zout is low and flat across the entire audio band. We dare you to find or
build a better regulator! Below is a capture of the 20KHz measurement spectrum. Note that the noise floor
is due to the spectrum analyzer, not the Superpower.

Superpower, 100mApk-pk load at 10KHz

Spectrum of Superpower driving 100mA pk-pk into 50Ω.

SPZ is here!

SPZ, a small 3A SPJ replacement that fits into the space for a monolithic TO-220.

Same low noise

Same blazing step response

Same great ripple rejection

More current: 3A

AND it's small enough to directly replace a LM1117 or LM7805!Order now from our store.

Authorized Upgrade Centers

Always wanted to improve your system but modifying it makes you nervous?
Now you can let a professional do it! Go to our
Authorized Upgrade Centers page to find companies that can
replace your existing regulators with Belleson Superpower.

Build a power supply

A PCB and parts list for building a compact dual positive or positive+negative power supply
are on this new page.

Transformer Calculator!

Use the Belleson Transformer Calculator
to calculate the minimum Vrms voltage of a transformer for your
Superpower based supplies.

It's Official

We're proud to announce the U.S. Patent and Trademark Office has granted patent 8,294,440 to the Superpower design.